Patents by Inventor David E. Hutka

David E. Hutka has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Positively charged liquid developer compositions
    Patent number: 4886729
    Abstract: A positively charged liquid developer composition comprised of polymer particles, a hydrocarbon liquid component, a charge director comprised of lecithin, and as pigment particles the beta crystalline form of copper phthalocyanine.
    Type: Grant
    Filed: July 15, 1988
    Date of Patent: December 12, 1989
    Assignee: Xerox Corporation
    Inventors: Bernard Grushkin, David E. Hutka, Louis V. Isganitis, Edward J. Radigan